Digital BW, The Print

Hi all

Does anyone have any idea how much needs to be printed to purge the K line on a 4800 
(African style).  I have made a simple QTR curve which limits K to 70% (and does not use any 
of the other inks).  I've printed one sheet of pure black A3 (using Faster and 2880dpi).  As I 
am trying to flush Epson MK and replace it with MIS Eboni the difference is not obvious (and I 
want to do some curves/linearization after the flush so would prefer not to be measuring MK 
instead of Eboni).  

Thoughts?  Educated guesses?

Cheers

Steve

OK I think I can answer my own question:

A little over one sheet of A3 solid black - so two to be sure?  I printed
two sheets.  They are now lying on the floor and it is shocking how much
darker the MIS Eboni sheet, the second sheet, is!!

> From: Steve Kale <stevekale@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Tue, 09 Aug 2005 20:04:16 -0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: [Digital BW] Purging the K line on a 4800 (African style)
> 
> Hi all
> 
> Does anyone have any idea how much needs to be printed to purge the K line on
> a 4800 
> (African style).  I have made a simple QTR curve which limits K to 70% (and
> does not use any 
> of the other inks).  I've printed one sheet of pure black A3 (using Faster and
> 2880dpi).

Hmmm stet that - I loaded the first sheet of paper incorrectly and printed
to the wrong side (Epson Watercolour) which I think mostly explains the
dramatic difference in black!!  So I am still after educated guesses...

> From: Steve Kale <stevekale@...>

> 
> OK I think I can answer my own question:
> 
> A little over one sheet of A3 solid black - so two to be sure?  I printed
> two sheets.  They are now lying on the floor and it is shocking how much
> darker the MIS Eboni sheet, the second sheet, is!!

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Steve Kale 
<stevekale@b...> wrote:
> Hmmm stet that - I loaded the first sheet of paper incorrectly and 
printed
> to the wrong side (Epson Watercolour) which I think mostly explains 
the
> dramatic difference in black!!  So I am still after educated 
guesses...
> 
> 


If you drained the damper, probably one head cleaning would do the 
job. That's about all I need for my 9500, but then again it has fewer 
nozzels so you may need more than one.

I did not drain the damper - just swapped the cartridge...

> From: dfaprinting <dfaprinting@...>

> 
> 
> If you drained the damper, probably one head cleaning would do the
> job. That's about all I need for my 9500, but then again it has fewer
> nozzels so you may need more than one.

Unfortunately the 7600/9600 machinses have a different damper setup: 
the're all attached to a frame that makes it necessary to pull all the 
dampers. That creates huge problems that require many cleaning cycles 
to clear up. If they have used that or a similar setup in the K3 prin 
ters, you don't want to go that route.


Steve Karafyllakis

> 
> 
> If you drained the damper, probably one head cleaning would do the 
> job. That's about all I need for my 9500, but then again it has fewer 
> nozzels so you may need more than one.

Steven Karafyllakis wrote:

>Unfortunately the 7600/9600 machinses have a different damper setup: 
>the're all attached to a frame that makes it necessary to pull all the 
>dampers. That creates huge problems that require many cleaning cycles 
>to clear up. If they have used that or a similar setup in the K3 prin 
>ters, you don't want to go that route.
>
>
>  
>
I guess the K3's are more in 10000 style (similar head construction + 
assembly of the heads) and that's worse for the damper cleaning etc than 
the 9600 version. On the last it is still possible to clean and replace 
the dampers manually. The 10000 heads/damper assembly is more or less a 
solid block that can't be separated. The dampers are big so it takes 
time to get them clogged but that's the only advantage. I'm using other 
methods to change inks on the 10000 as I dare not take the head assembly 
apart and I'm not really a coward in this metier. The answer on cleaning 
the dampers, inklines and ink changing on the new machines will most 
likely be with reverse flow and carts that can suck the ink out like I 
already do Electric valves in the inklines will be a new thing too. They 
are needed to prevent ink flowing back from the heads-inklines into the 
carts that are substantially lower than the head assembly. Membrane 
valves in the carts as an extra prevention (like the 10000 carts have) 
will make refilling without changes to the cart impossible.

However the 4800 though a K3 printer is similar to the 4000,9600,7600 
concept of head and damper design.

Ernst